Flow control systems manufactures positive displacement rotary piston flowmeters for various liquids to be measured accurately in industries. Flowmeter is of the size 50 mm nb, having flow ranges fifom 50 to 600 lpm. These flowmeters offer an accuracy of ±0.5% of the measured value with negligible pressure drop with added special features of flame-proof enclosure certified by cmri dhanbad, for applications in hazardous areas. Other ranges are from sizes 10 mm to 40 mm nb having flow range of 0.2 to 200 lpm. Features include: only one moving part; can also work bi-directionally; non-contacting sensor; bright led display counters, which are visible from 20 feet distance; batch/ totaliser/rate of low/pulse output and 4-20 ma output for pc/plc/dcs can be provided; and the electronic construction is upgradable to complete automation. Uses are in chemical, petroleum, pharmaceutical and engineering industries.